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Old 2003.01.12, 05:10 PM   #1
Dirtbag
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MZR diff w/ ceramic balls (scratchy)

Yo, my dad gotta mzr.com diff with balls and the diff was just horribly scratchy and not smooth at all! Now, I know this doesn't happen to everyone, it could have just been a defect. Well anyway, to cure a scratchy non smooth diff, we put associated diff grease just on the balls! DO NOT put it all over the rings, its way too much grease. Next, we hooked the diff up to a 4,000 rpm drill and held the spur gear and floored the drill for about 30 seconds. The diff will be as smooth as silk, I think the reason the diff is smooth now is the micro 'pits' on the diff rings were smoothed down to let the diff balls roll on the rings without as much friction. Mini-Z, are the diff rings polished?? Most competition 1/10 scale diffs have polished diff rings and that prevents all micro 'pits' from messing up the diff action.

My GPM diff with a delrin gear and titanium shaft came with polished diff rings and this never occured. Mini-Z, I reccomend polishing the diff rings if you don't, and/or, everyone else do the precedure above.

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Old 2003.01.12, 05:28 PM   #2
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What a great post! Lots of info.

Ref Qty of grease: The splashes of grease on the inside of my body should have given away the fact that i was using to much grease. I will cut back a bit.


Ref smoothing out the pits: One of of my ball diffs seems like it has sand in it compared to the other. Two different manufactures. Could have somthing to do with it. I would like to try the smoothing out the micro 'pits' on the sandy one.

Would you describe how you hooked up the ball diff to the drill?

I mean it seems simple enough. I just wanna confirm.

-take ball diff off the car
-put the long end of the shaft into the drill
- tighten down the drill on the shaft
- maybe put the wheel on the spur gear side
- hold the wheel fire up the drill... ?



Thanks in advance,

fia_f1

Last edited by fia_f1; 2003.01.12 at 05:32 PM.
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Old 2003.01.12, 05:42 PM   #3
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Your steps are right, except that you hold the spur gear. A wheel on one end isn't needed. Be careful not to run the drill too long, if you do it too long you could fry your diff possibly, do it on 10 second intervals and check the smoothness of the diff, the diff is done when you do not feel the diff 'hang up' or like feel crunchy in any places.

Thanks for the positive feedback.

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Old 2003.01.12, 06:38 PM   #4
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great tip dirtbag It's been a while since I've heard anything usefull, keep it comin
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Old 2003.01.12, 07:13 PM   #5
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UPDATE

Ok, I found that Team Losi thrust bearing lubrication (thrust bearing lube) works much better than the associated diff grease. It a whitish/clearish color and the tube it comes in says Team Losi on it, if your LHS has Team Losi parts, you will have no problem finding it.
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Old 2003.01.12, 07:26 PM   #6
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UPDATE 2

Also tighten the diff down pretty snug so where one diff ring is spinning the oppisite direction of the other diff ring. You will fry your diff if you don't do this.
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Old 2003.01.12, 07:31 PM   #7
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Re: UPDATE

Quote:
Originally posted by Dirtbag
Ok, I found that Team Losi thrust bearing lubrication (thrust bearing lube) works much better than the associated diff grease. It a whitish/clearish color and the tube it comes in says Team Losi on it, if your LHS has Team Losi parts, you will have no problem finding it.

this is what i use, its good stuff
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Old 2003.01.13, 11:00 AM   #8
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Thanks for the feedback Dirtbag! This is the first time we've heard anything like this about our diffs, so I'd say it was just a rare minor defect, but we'll certainly incorporate this into our production. Great tips btw! Thanks!
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Old 2003.01.13, 09:03 PM   #9
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No problem, I really don't like giving negative feedback, but if I can turn that into a tip, great.
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